Napa Weather in 1978

Historical record of Napa, California weather for the year 1978 based on NOAA data.

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1978 Napa Weather Extremes
Highest temperature	100 °F	September 24
Lowest temperature	25 °F	December 31
Highest daily low	69 °F	May 31
Lowest daily high	43 °F	December 27
Most daily precipitation	1.9 inches	January 16
Most daily snow	none	-
Total annual precipitation	28.7 inches	-
Total annual snow	none	-

What was the hottest temperature in Napa in 1978?

The highest temperature recorded in Napa, California in 1978 was 100 °F which happened on September 24.

Highest Temperatures: All-Time By Year

Highest Temperatures in Napa in 1978

Rank	Temperature	Date
1	100 °F	Sep 24
2	99 °F	Oct 13
2	99 °F	Sep 25
4	98 °F	Sep 29
5	97 °F	May 30
6	96 °F	Sep 30
6	96 °F	Aug 5
6	96 °F	Jun 6
9	95 °F	Oct 12
9	95 °F	Oct 2
9	95 °F	Jul 14
9	95 °F	May 31

What was the coldest temperature in Napa in 1978?

The lowest temperature recorded in Napa, California in 1978 was 25 °F which happened 3 different times.

Lowest Temperatures: All-Time By Year

Lowest Temperatures in Napa in 1978

Rank	Temperature	Date
1	25 °F	December 31
1	25 °F	December 30
1	25 °F	December 21
4	26 °F	December 20
5	28 °F	December 23
5	28 °F	December 16
5	28 °F	December 8
5	28 °F	November 15
5	28 °F	November 14
5	28 °F	November 12

January 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
January 1	56	41	0.03
January 2	55	48	0.13
January 3	59	49	0.10
January 4	55	46	1.32
January 5	58	45	1.01
January 6	62	45	0.35
January 7	59	41	0.01
January 8	61	51	0.06
January 9	62	54	1.18
January 10	67	50	0.03
January 11	65	40	0.00
January 12	58	45	0.51
January 13	59	51	0.12
January 14	60	50	1.40
January 15	56	50	1.00
January 16	58	51	1.90
January 17	60	50	0.20
January 18	57	47	0.12
January 19	62	50	0.70
January 20	62	40	0.00
January 21	56	45	0.00
January 22	60	36	0.00
January 23	59	32	0.00
January 24	61	38	0.00
January 25	59	37	0.00
January 26	61	37	0.00
January 27	62	37	0.00
January 28	60	39	0.00
January 29	56	39	0.00
January 30	52	42	0.00
January 31	51	44	0.00

February 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
February 1	55	45	0.03
February 2	63	51	0.02
February 3	61	50	0.00
February 4	62	42	0.00
February 5	60	48	0.80
February 6	59	51	0.75
February 7	70	51	0.86
February 8	59	44	0.35
February 9	56	43	0.62
February 10	57	40	0.00
February 11	64	34	0.00
February 12	59	34	1.01
February 13	57	42	0.20
February 14	60	40	0.00
February 15	63	41	0.00
February 16	58	40	0.00
February 17	57	42	0.00
February 18	65	45	0.00
February 19	67	46	0.00
February 20	70	44	0.00
February 21	72	42	0.00
February 22	75	43	0.00
February 23	70	45	0.00
February 24	65	49	0.00
February 25	69	48	0.00
February 26	64	49	0.00
February 27	63	36	0.00
February 28	71	41	0.00

March 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
March 1	64	52	0.23
March 2	60	53	0.80
March 3	65	52	0.20
March 4	62	53	1.23
March 5	64	53	0.37
March 6	66	42	0.00
March 7	68	48	0.00
March 8	62	54	0.45
March 9	63	52	0.62
March 10	63	41	0.01
March 11	63	41	0.10
March 12	69	39	0.16
March 13	63	39	0.00
March 14	70	43	0.00
March 15	74	43	0.00
March 16	77	43	0.00
March 17	82	49	0.00
March 18	77	52	0.00
March 19	80	52	0.00
March 20	76	48	0.00
March 21	67	54	0.00
March 22	69	53	0.48
March 23	65	53	0.15
March 24	69	42	0.00
March 25	75	44	0.00
March 26	74	49	0.00
March 27	69	51	0.00
March 28	68	50	0.00
March 29	65	50	0.00
March 30	70	52	0.00
March 31	65	54	0.82

April 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
April 1	60	51	0.14
April 2	65	38	0.05
April 3	62	44	0.00
April 4	62	40	0.43
April 5	58	39	0.00
April 6	59	45	0.72
April 7	60	31	0.18
April 8	75	41	0.00
April 9	85	41	0.00
April 10	81	47	0.00
April 11	74	51	0.00
April 12	72	55	0.00
April 13	66	52	0.00
April 14	64	45	0.00
April 15	59	48	1.50
April 16	61	39	0.07
April 17	66	37	0.00
April 18	69	39	0.00
April 19	64	45	0.12
April 20	66	44	0.03
April 21	67	36	0.00
April 22	69	37	0.00
April 23	75	42	0.00
April 24	71	52	0.09
April 25	66	51	0.31
April 26	71	48	0.08
April 27	71	45	0.00
April 28	71	46	0.00
April 29	71	45	0.00
April 30	69	42	0.05

May 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
May 1	81	49	0.02
May 2	85	50	0.00
May 3	81	51	0.00
May 4	76	47	0.00
May 5	74	48	0.00
May 6	79	47	0.00
May 7	81	48	0.00
May 8	87	48	0.00
May 9	82	48	0.00
May 10	70	48	0.00
May 11	71	42	0.00
May 12	84	48	0.00
May 13	86	51	0.00
May 14	81	51	0.00
May 15	69	51	0.00
May 16	79	41	0.00
May 17	87	52	0.00
May 18	91	48	0.00
May 19	92	52	0.00
May 20	90	51	0.00
May 21	71	50	0.00
May 22	71	51	0.00
May 23	71	44	0.00
May 24	67	40	0.00
May 25	70	41	0.00
May 26	75	45	0.00
May 27	83	47	0.00
May 28	87	55	0.00
May 29	94	54	0.00
May 30	97	55	0.00
May 31	95	69	0.00

June 1978 Napa Weather

Day	High (°F)	Low (°F)
June 1	73	48
June 2	73	47
June 3	74	45
June 4	83	50
June 5	88	51
June 6	96	54
June 7	94	52
June 8	84	54
June 9	82	51
June 10	77	52
June 11	79	49
June 12	80	51
June 13	79	50
June 14	76	49
June 15	78	45
June 16	83	49
June 17	84	50
June 18	78	52
June 19	78	50
June 20	76	48
June 21	76	53
June 22	75	50
June 23	73	56
June 24	76	47
June 25	81	49
June 26	80	52
June 27	70	55
June 28	71	54
June 29	77	53
June 30	78	50

July 1978 Napa Weather

Day	High (°F)	Low (°F)
July 1	74	47
July 2	76	46
July 3	83	48
July 4	85	52
July 5	89	51
July 6	85	49
July 7	74	54
July 8	91	53
July 9	90	50
July 10	80	53
July 11	72	53
July 12	73	51
July 13	93	54
July 14	95	57
July 15	90	53
July 16	89	54
July 17	92	55
July 18	90	55
July 19	89	54
July 20	80	50
July 21	86	53
July 22	83	54
July 23	80	53
July 24	87	53
July 25	82	53
July 26	80	54
July 27	77	53
July 28	75	50
July 29	74	47
July 30	80	50
July 31	90	51

August 1978 Napa Weather

Day	High (°F)	Low (°F)
August 1	89	61
August 2	74	50
August 3	78	50
August 4	84	58
August 5	96	58
August 6	94	58
August 7	87	59
August 8	85	58
August 9	81	58
August 10	78	51
August 11	75	49
August 12	77	51
August 13	80	52
August 14	92	53
August 15	89	54
August 16	77	55
August 17	84	48
August 18	87	50
August 19	88	47
August 20	91	51
August 21	82	51
August 22	78	46
August 23	76	46
August 24	77	53
August 25	81	51
August 26	78	52
August 27	82	50
August 28	88	53
August 29	86	57
August 30	81	53
August 31	81	57

September 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
September 1	91	58	0.00
September 2	94	54	0.00
September 3	82	56	0.00
September 4	79	59	0.00
September 5	76	60	0.00
September 6	76	52	0.00
September 7	77	45	0.00
September 8	80	47	0.00
September 9	77	61	0.33
September 10	75	57	0.50
September 11	84	51	0.00
September 12	88	59	0.00
September 13	87	52	0.00
September 14	83	53	0.00
September 15	86	51	0.00
September 16	87	54	0.00
September 17	83	51	0.00
September 18	77	46	0.00
September 19	79	54	0.00
September 20	85	47	0.00
September 21	84	48	0.00
September 22	91	48	0.00
September 23	90	47	0.00
September 24	100	55	0.00
September 25	99	59	0.00
September 26	87	54	0.00
September 27	80	58	0.00
September 28	92	51	0.00
September 29	98	57	0.00
September 30	96	57	0.00

October 1978 Napa Weather

Day	High (°F)	Low (°F)
October 1	92	53
October 2	95	54
October 3	92	53
October 4	88	52
October 5	79	49
October 6	74	52
October 7	83	48
October 8	82	48
October 9	75	45
October 10	87	45
October 11	93	49
October 12	95	51
October 13	99	53
October 14	86	54
October 15	80	59
October 16	76	50
October 17	76	55
October 18	72	52
October 19	67	51
October 20	70	50
October 21	72	46
October 22	83	44
October 23	85	46
October 24	83	46
October 25	80	47
October 26	71	43
October 27	68	41
October 28	71	44
October 29	74	41
October 30	69	39
October 31	68	46

November 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
November 1	69	39	0.00
November 2	74	39	0.00
November 3	73	40	0.00
November 4	76	36	0.00
November 5	75	35	0.00
November 6	83	42	0.00
November 7	82	44	0.00
November 8	82	44	0.00
November 9	73	44	0.00
November 10	70	41	0.00
November 11	69	39	0.00
November 12	66	28	0.46
November 13	52	29	0.07
November 14	61	28	0.00
November 15	60	28	0.00
November 16	68	46	0.00
November 17	64	35	0.00
November 18	61	36	0.00
November 19	60	35	0.86
November 20	61	45	0.75
November 21	59	48	0.27
November 22	55	44	0.12
November 23	63	41	0.00
November 24	68	37	0.00
November 25	59	36	0.00
November 26	60	34	0.00
November 27	60	32	0.00
November 28	64	37	0.00
November 29	60	41	0.00
November 30	58	45	0.00

December 1978 Napa Weather

Day	High (°F)	Low (°F)	Precip. (inches)
December 1	65	50	0.08
December 2	64	39	0.00
December 3	64	33	0.00
December 4	63	34	0.00
December 5	57	45	0.00
December 6	55	36	0.00
December 7	52	36	0.00
December 8	53	28	0.00
December 9	55	30	0.00
December 10	60	32	0.00
December 11	62	35	0.00
December 12	63	40	0.00
December 13	68	37	0.00
December 14	66	33	0.00
December 15	63	34	0.00
December 16	60	28	0.00
December 17	53	44	0.73
December 18	50	36	0.26
December 19	54	30	0.00
December 20	54	26	0.00
December 21	56	25	0.00
December 22	57	29	0.00
December 23	55	28	0.00
December 24	52	33	0.00
December 25	52	34	0.00
December 26	50	30	0.00
December 27	43	35	0.04
December 28	54	35	0.00
December 29	52	30	0.00
December 30	47	25	0.00
December 31	54	25	0.00

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Weather Station Details

Years	Station	Coordinates
1999–2024	Napa County Airport	location
1901–1998	Napa State Hospital	location